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"I had my head up my ass," Harmon admits of acid-tongued podcast rant on Sunday

Dan Harmon has pulled his foot out of his mouth long enough to apologize for trashing "Community" shortly after he signed back on to the NBC show that he was ousted from last year.

In an early Tuesday morning Tumblr post titled "It Won't Happen Again Again," "Community" creator Harmon offered a lengthy mea culpa for comments he made during his podcast on Sunday: He apologized not just to the show's fans, but to the cast, crew and writers on the series' fourth season, which he savaged during the podcast.

"I am first and foremost sorry to 'Community' fans that got paid nothing to stick by 'Community' and get us to a fifth season only to hear the incoming showrunner say some stuff that felt very un-'Community,'" Harmon wrote. "Even if my goal had been to hurt someone, it would never have been you. What I said was disrespectful to your love for this show, love that I sometimes erroneously equate with validation of me as a person."

Harmon went on to apologize to the Season 4 writers with scatological flair.

"I’m sorry I pooped on your work," Harmon offered. "You had to do something nobody should have to attempt, and you had the option of doing it the lazy way or the sellout way and you clearly did what you did because you were thinking of the fans. There was some amazing stuff in there. Funny jokes."

Harmon, who is returning as an executive producer for the fifth season of the series, raised eyebrows when he went off about the show's most recent season during the podcast.

One of the nicer things he said was that the season was "not my cup of tea."

On the coarser end of Harmon's comments, he opined that watching Season 4 of "Community" was akin to "flipping through Instagram and watching your girlfriend just blow a million [people]."

In his apology Tuesday, Harmon — who was fired from the ratings-challenged show last year following a public feud with (since departed) series star Chevy Chase — admitted that he had binged on sour grapes when he made his comments.

"I was just indulging my petty feelings about being left out," Harmon wrote. "It seemed kind of funny at the time because it seemed at the time like I was the only person with feelings. Because my head was up my ass."